Binocular Optotype Brightness Control for Ocular Deviation Detection
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Solution Overview
Problem
Conventional ophthalmologic apparatuses fail to detect ocular deviation and estimate eyestrain accurately when an examinee has no exophoria and/or esophoria, as ocular deviation does not occur with destroyed fusion in binocular vision conditions.
Innovation Solution
An ophthalmologic apparatus that includes an optotype presentation mechanism to present optotypes with adjustable brightness differences to both eyes, a convergence adjustment mechanism to control convergence distance, and an eye information obtaining portion to detect visual line directions, allowing detection of ocular deviation regardless of heterophoria presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ocular deviation detection is based on fusion destruction by darkening visual field, then eyestrain can be estimated for subjects with heterophoria, but ocular deviation cannot be detected for subjects without heterophoria
Solution Approach 1:
The patent changes the detection parameter from fusion status to visual line direction. By measuring the actual direction of visual lines using eye tracking technology, the system can detect ocular deviation regardless of whether the subject has heterophoria. This parameter change enables universal applicability across different subject types while maintaining detection accuracy.
Solution Approach 2:
The patent performs preliminary measurement of the convergence distance before conducting the eyestrain estimation. By first determining the subject's convergence characteristics and setting the optotype presentation distance accordingly, the system ensures that visual line direction changes can be properly detected and measured, enabling accurate ocular deviation detection for all subjects.
2Measurement precision
If convergence distance is set to optotype presentation distance, then binocular vision condition is maintained, but ocular deviation cannot be detected when brightness difference is increased
Solution Approach 1:
The patent performs preliminary measurement of the convergence distance and uses this information to set the optotype presentation distance. By establishing the convergence characteristics first, the system creates optimal conditions for detecting visual line direction changes when brightness difference is increased, enabling accurate ocular deviation detection while maintaining proper binocular vision conditions.
Solution Approach 2:
The patent replaces the mechanical approach of physically adjusting convergence with an optical/electronic approach. By using eye tracking technology to measure visual line directions and calculating convergence distance from these measurements, the system achieves more precise and adaptable convergence control compared to traditional mechanical adjustment methods.
Data Source
AI summary
An ophthalmologic apparatus includes an optotype presentation mechanism that presents an optotype to a left subject eye and a right subject eye, and is capable of changing a brightness difference between the optotype presented to the left subject eye and the optotype presented to the right subject eye, a convergence adjustment mechanism configured to adjust a convergence distance, an eye information obtaining portion configured to obtain eye information on the left subject eye and the right subject eye, and a controller configured to control the optotype presentation mechanism, the convergence adjustment mechanism, and the eye information obtaining portion, wherein the controller sets the convergence distance to a distance different from a optotype presentation distance, gradually increases a brightness difference, and detects a visual line direction of the left subject eye and a visual line direction of the right subject eye based on the eye information.